Novel User Scheduling Schemes Based on Nonlinear Precoding for Multiuser MIMO Systems

• Published in: Applied Mechanics and Materials Vol. 195-196; pp. 270 - 276
• Main Authors: Ma, Guo Dong, Wu, Mu Qing, Chen, Run Qian, Zhang, Cun Yi
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 01.01.2012
• Subjects: Streams Reduction; Block Diagonal Geometric Mean Decomposition; Multiuser MIMO; User Ordering
• ISBN: 3037854693; 9783037854693
• ISSN: 1660-9336; 1662-7482; 1662-7482
• DOI: 10.4028/www.scientific.net/AMM.195-196.270

This paper proposes a novel greedy user ordering algorithm for the multiuser multiple-input multiple-output (MIMO) systems employing block diagonal geometric mean decomposition method and Tomlinson-Harashima precoding (THP). Theoretical analysis and computer simulations illustrate its low computation complexity relative to the optimal user ordering achieving by brute search over all the possible ordering permutations resulting in extremely high computation complexity. Meanwhile the bit error rate (BER) performance of the proposed algorithm is very close to the optimal user ordering. Moreover, in order to mitigate the impact of users with smaller sub-channel gains to the whole systems BER performance, a joint pre-processing scheme design of adaptive data streams reduction and greedy user ordering (ADSR-GUO) is proposed. By means of choosing different values for the controlling factor, we can obtain different system sum-rate and BER performance to satisfy different quality-of-service (QoS) requirements.